✨ add new indices

+ NDWI
+ NDTI
+ NDRE

src/app/calculator/calculator.service.ts

@@ -16,11 +16,21 @@ import {FieldService} from './field.service';
 import {ZonesService} from './zones.service';
 import {imageWmsTLayer, imageWmsTSource} from './image-wms-t-layer';
 
-export type Index = 'EVI' | 'NDVI' | 'RVI4S1';
+/**
+ * Set of precalculated indices
+ */
+const INDICES_PRE_FLIGHT = ['EVI', 'NDVI', 'RVI4S1'] as const;
+/**
+ * Set of indices which are calculated on the fly
+ */
+const INDICES_ON_THE_FLY = ['NDWI', 'NDTI', 'NDRE'] as const;
+export type IndexPreFlight = typeof INDICES_PRE_FLIGHT[number];
+export type IndexOnTheFly = typeof INDICES_ON_THE_FLY[number];
+export type Index = IndexPreFlight | IndexOnTheFly;
 
 @Injectable({providedIn: 'root'})
 export class CalculatorService {
-  AVAILABLE_PRODUCTS = ['EVI', 'NDVI', 'RVI4S1'] as const;
+  AVAILABLE_PRODUCTS = [...INDICES_PRE_FLIGHT, ...INDICES_ON_THE_FLY].sort();
   BLUR_MIN_VALUE = 0 as const;
   BLUR_MAX_VALUE = 5 as const;
   MIN_LPIS_VISIBLE_ZOOM = 15 as const;
@@ -126,17 +136,20 @@ export class CalculatorService {
   }
 
   /**
-   * Call 'get_zones' API method
+   * Call 'get_zones' or 'get_zones_exp' API method
    */
   async getZones({product}: {product: Index}) {
     this.lastError = '';
     this._zonesLoading = true;
+    const endpoint = INDICES_PRE_FLIGHT.includes(product as IndexPreFlight)
+      ? 'get_zones'
+      : 'get_zones_exp';
     try {
       const data = await this.httpClient
         .post(
           (this.proxyEnabled() ? this.hsConfig.apps.default.proxyPrefix : '') +
             this.SERVICE_BASE_URL +
-            'get_zones',
+            endpoint,
           {
             product,
             number_of_quantiles: this.quantileCount,
@@ -154,6 +167,11 @@ export class CalculatorService {
         )
         .toPromise();
       console.log('data received!', data);
+      // in case of unreliable data the return value is {"error": "data is not reliable."}
+      // TODO: show this error message to user
+      if (data['error']) {
+        throw new Error(data['error']);
+      }
       this._zonesLoading = false;
       await this.zonesService.updateZones(data, {
         quantileCount: this.quantileCount,